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# Guide to Perl

## Introduction

cPanel & WHM ships with multiple Perl environments. Perl modules allow you to add custom functionality to a cPanel & WHM server.

Note:
For a list of CPAN modules that cPanel & WHM includes, read the [Third-Party Software](https://docs.cpanel.net/knowledge-base/third-party/third-party-software/) documentation for the appropriate version of cPanel & WHM.

## Perl uses in cPanel & WHM

cPanel & WHM's backend is Perl-based, and you can use Perl in many custom cPanel & WHM applications:

* [LiveAPI Perl Module ](/guides/guide-to-the-liveapi-system/guide-to-the-liveapi-system-perl-module/) — The LiveAPI Perl Module provides an environment for Perl applications. Use the LiveAPI system in conjunction with cPanel & WHM's APIs to create integrated cPanel & WHM applications.
* [cPanel Licensing Perl Module](https://docs.cpanel.net/manage2/knowledge-base/guide-to-the-manage2-api/) — The Manage2 API automates cPanel license management procedures. Use this module to integrate with Manage2, cPanel's license management interface.
* [Perl Hook Action Code](/guides/guide-to-standardized-hooks/guide-to-standardized-hooks-hook-action-code) — Standardized Hooks trigger applications when cPanel & WHM performs an action. You can create hook action code in a custom Perl module or as an executable script.


Note:
The term "Boolean" in our documentation refers to parameters that accept values of `1` or `0`. cPanel & WHM's APIs do **not** support the literal values of `true` and `false`.